Question

Which of the following processes will be least affected by the viscosity of water? 

(a) Water flowing through a pipe 

(b) Air bubble rising up through water 

(c) A wide, shallow sheet of water flowing on a flat surface 

(d) Water flowing out through a hole in the side of a tank

Answer 1

Correct Answer is: (d) Water flowing out through a hole in the side of a tank

When water flows out of a hole in a tank, it is in contact with the edges of the hole over a very small area, and therefore viscosity effects are small.